Many thanks to SWLing Post contributor, Neil Goldstein, who writes:
I added a sub-page to radiokitguide.com with a list of the remaining electronics and radio surplus outlets I was able to find and verify. The list is evolving, but is complete enough to publish at this point. Enjoy!
https://fofio.blogspot.com/2020/07/sources-parts--outlets-and-more.html
Many thanks for sharing, Neil!
I use AllElectroncs.com for small items. And not too far from this QTH is GreenBrookElectronics.com.
Is that Mendelsohn’s in Dayton I see there? Happy days!
If it isn’t a USA only list, then you may add the following two
http://www.ur4ll.net/
https://www.radiosurplus.it/